<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			*{
				padding:0;
				margin: 0;
				box-sizing: border-box;
			}
			body{
				display: flex;
				justify-content: center;
				align-items: center;
				height: 100vh;
				background: #000;
			}
			div{
				width: 100px;
				height: 100px;
				background: red;
				position: relative;
				/* filter: blur(50px); */
			}
			div::before{
				content: '';
				background: red;
				position: absolute;
				left: 0px;
				top: 0px;
				bottom: 0px;
				right: 0px;
				z-index: -1;
				filter: blur(50px);
			}
		</style>
	</head>
	<body>
		<div></div>
	</body>
</html>
